model on 22 September 2020. An appliance developed on the architecture model has been available since October 2020. The architecture model is based exclusively on de facto and de jure standards and the appliance developed according to it was realised exclusively with open source products. The three main standards are Business Process Model and Notation (BPMN), Representational State Transfer (REST) and OpenID Connect (OIDC). Scalability, distributability and extensibility are further essential features and enable the use in organisations of different sizes. See also Data curation Digital preservation National Digital Library Program (NDLP) National Digital Information Infrastructure and Preservation Program (NDIIPP) CASPAR digital preservation project Trustworthy Repositories Audit & Certification National Digital Preservation Program (NDPP), India References Reference Model for an Open Archival Information System (OAIS), Recommended Practice, CCSDS 650.0-M-2 (Magenta Book) Issue 2, June 2012 = 580 Work co-ordinated by RLG and NARA on standard(s) for accreditation of archives. Consultative Committee for Space Data Systems ISO 19165-1:2018 Geographic information -- Preservation of digital data and metadata -- Part 1: Fundamentals Reference models Online archives Archival science Consultative Committee for Space Data Systems Digital preservation